Your child needs to learn and know all these spellings before the SATs examinations which start on Monday 13th May 2019.
You might find the following link helpful:
As well as the spellings above, your children need to learn certain spelling patterns. See pages 59-63, 66-70 of the English National Curriculum document
As well as the Year 3/4, 5/6 spellings above, your child is expected to learn certain spelling rules/patterns, and be able to accurately spell words that contain them. Every week, the children are given twenty spellings to learn, based on the patterns they have learned during the week. They are tested on the spellings every Monday.